Theodore w



(No Model.)

T. W. EVERSOLE. SELF HEATING SOLDERING IRON.

No. 525,494. Patented Sept. 4, 1894.

5 ,5 I 4.55 53:57 i I: 52.2.; ,5 5, it; I /////h V UNITED STATES PATENTOFFICE.

THEODORE W. EVERSOLE, OF WASHINGTON, DISTRICT OF COLUMBIA.

SELF-HEATING SOLDERlNG-IRON.

SPECIFICATION forming part of Letters l atent No. 525,494, datedSeptember 4, 1894. Application filed May 29,1893. Serial No. 475,919-(llo model.)

To all whom it may concern:

Be it known that I, THEODORE W. EVER- SOLE, a citizen of the UnitedStates, residing at Washington, in the District of Columbia, haveinvented certain new and useful Im provements in Self-HeatingSoldering-Irons; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

My invention relates to soldering irons, and it is an improvement uponthe self-heating iron heretofore patented by me, No. 388,187, datedAugust 21, 1888.

The present invention consists in certain details of construction whichwill be duly set forth hereinafter.

The object of the improvement is to render the iron more serviceable andefficient, certain practical objections incident to prior constructionshaving been at length overcome, as hereinafter set forth. I

In the drawings, Figure 1 is alongitudinal section of my improvedsoldering iron. Fig.

2 shows a modification of the pump. Fig. 3 is a view on an enlargedscale of the regulating valve. Fig.4 shows a modified valve. Fig. 5 isan end View of. the reservoir'with the pump rod in section. Fig. 6 is anend view of the iron, with the holder removed. Fig. 7 is an end view ofthe swivel nut, and Fig. 8 is an end view of the tip. Fig. 8 is a sideview of the same. Figs. 9 and 10 are sectional and end viewsrespectively of a modified construction of the burner.

The general construction of the iron is the same as in the one shown anddescribed in my patent above referred to.

The handle A is hollow to constitute a res ervoir for the gasoline orother liquid fuel. Its rear end is closed by a screw plug B, whichclamps the flange c at therear end of the air pump barrel 0, housedwithin the handle A. The flange is suitably packed to make a tightjoint. A'check valve 0' closes the port 0 in the inner end of the pumpbarrel. It is found that the gasoline corrodes this valve '(which isusually made of soft rubber), thereby perunion G.

mitting the air to escape and thus weakening the pressure in thereservoir. To overcome this, I prefer to make the pump rod 0' tubular asshown in Fig. 2, and provide a central opening through the handle 0 andpiston 0, so that I am enabled to insert a stem 0 having its inner endheaded or otherwise suitably formed to close the port 0 The stem 0 isexternally threaded to mesh with an internal thread in the tube 0, andits outer end has a handle 0 preferably similar in shape to the handle 0The pump rod 0 has a projecting pin 0 which is adapted to enter an L-shaped slot b in the neck of the screw plug B. A slight turn of the pumprod 0' looks the pin in the slot, and securely holds the pump rod whilethe valve stem 0 is screwed in to close the port 0 By this means, theair pressure produced by the pump can be held in the reservoir. In theforward end of the'reservoir A is an opening into which is screwed orotherwise tightly secured a pipe vD leading to the burner. Fitting theend of this pipe is a plug E, which governs the flow of gasoline intothe pipe. ,This plug may be a screw, flattened on one or more sides, orit may be a round plug with one or more grooves running lengthwise asshown in Fig. 4. The filling orifice of the reservoir is located closeto this plug, so that said plug can be adjusted when the stopper a isremoved from said Ollfice.

Through the plug E runs a small tube F, which extends from near the rearend of the reservoir to or near to the outer end of the pipe D. Theportion of the tube inside of the pipe is preferably wrapped withasbestos c. When the iron is held with the point downthe upper end ofthe reservoir to the delivery end of the pipe D. When the iron isinclined upward, the gasoline feeds through the tube by reason of theair pressure, the air passing into the pipe around the plug E. The tubeF thus enables the iron to work equally well in any position. The outerend of the pipe D screws into a bushing g in a collar G of vulcanizedfiber, asbestos, or the like, which is clamped to the burner H by meansof the A washer g of similar material is placed at each end ofthecollar, the whole forming a non conducting connection be- 9O ward,this tube serves to conduct the air from k tween the handle and theburner, and preventing the handle from becoming uncomfortably ordangerously hot.

The burner is like that shown in my former patent, comprising acylindrical base carrying an arched pipe, one end of which communicateswith the tube D and the other with a minute jet orifice 77. at thecenter of the base, controlled by a needle valve. The arch of the pipelies in front of this orifice and transverse to the flame issuingtherefrom, so that the liquid fuel passing through this portion of thepipe becomes vaporized by the heat of the flame.

Some trouble hasbeen experienced with the burner valve by reason of theheating and consequent 7 expansion of its valve stem 1, which causes,its' screw threaded portion to bind in its nut and renders it hard toturn. I obviate this trouble by forming the body of the valve stemsmooth, and threading it at its outer portion only, forming theco-operating nut in the gland i. In case the stem should stick, a dropof oil can be applied to the threads. In the old construction thethreaded parts were inclosed and inaccessible for oiling.

In making the burner H it requires considerable care in molding andcasting to core out the passages. In lieu of coring, the burner may becast solid, and the passages drilled out, as shown in Fig. 9, the outerends of the drill holes being then plugged as at h. In thisconstruction, it is preferable to form squared shoulders h on the outerend of the burner, to give better opportunity for starting; the drill.When this construction is adopted, the hood K is preferably placedbetween the legs of the arched portion of the burner. The hood mayhowever, surround the arch as shown in Fig. 1, being simply afrusto-conical shell to confine the flame issuing from the jet orifice72.

The holder L is attachedto the burner by a bayonet joint or mutilatedscrew-thread, a slightly inclined groove 71. being formed on each sideof the base of the arched portion of the burner to receive lugs Z on theinside of the end of the holder. The sides of the holder containsuitable openings for the escape of gases, and for giving draft. Securedto the outer end of the holder is the tip M, which may be of the usualpyramidal shape, as in Fig. 1, or of any desired configuration. The tipmay be fastened directly to the holder but I prefer to use a swivelingattachment, to enable the tip to be angularly adjusted since it isdesirable to hold the iron with the filling orifice always uppermost.The swiveling attachment which I prefer is the ring or collar N having aflange n to seat against the internal flange Z on the holder andprovided with a threaded portion projecting out beyond the end of theholder to enter a tapped socket in the tip M. The collar has a number ofpins n or the like, to enable it to be held stationary by means of alever thrust through one of the openings in the holder, while the tip isbeing screwed on. By loosening'the tip it is free to be turned to anydesired angle, where the collar can be tightened to hold it. Thisconstruction also provides for readily and quickly changing the tip whendesired.

While I have described my soldering tool as provided with a tip M andholder L, yet I do not limit myself to such construction, but wish it tobe understood that I may omit the tip and holder and use the burner witha tapering hood upon it, such as the hood K. In this form itis availablefor many uses which will readily suggest themselves to those skilled inthe art.

Having thus described my inventiomwhat I claim is 1. In a self heatingsoldering iron, the combination with a reservoir of liquid fuel, of anair pump barrel, having a delivery port in its end, communicating withsaid reservoir, a hollow pump rod, and a stop valve having its stempassing through said pump rod, substantially as described.

2. In a self-heating soldering iron, the combination with a reservoirfor liquid fuel, of an air pump barrel,having a delivery port in its endcommunicating with said reservoir, a hollow pump rod, having internalscrew threads, and a stop valve having a threaded stem passing throughsaid pump rod, substantially as described.

3. In a self-heating soldering iron, the combination with a reservoirfor liquid fuel, of an air pump barrel, having a delivery portcommunicating with said reservoir, and provided with a check valve, anda stop valve for closing said port independently of the check valve,substantially as described.

4. In a self-heating soldering iron, the combination with an air pumpbarrel located inside the handle of the iron, havinga delivery portprovided with a check valve, of a stop valve for independently closingsaid port, and means for operating said valve from outside the handle ofthe iron, substantially as described.

5. In a self-heating soldering iron the combination with an air pumpbarrel, having a delivery port, of a hollow pump rod, a stop valvehaving its stem passing through the pump rod, and means for locking thepump rod when the piston is at the end of the delivery stroke,substantially as described.

6. In a self-heating soldering iron, the combination with the air pumphaving a screw plug B containing an L-shaped slot b, of a hollowinternally threaded pump rod having a pin 0 to engage with said slot,and a threaded stem passing through said rod and having a stop valve onits inner end, substantially as described.

7. In a. self-heating soldering iron, the combination with a tubularreservoir for liquid fuel and a pipe leading from one end thereof, of asmall air tube extending from near the other end of said reservoir tonear the delivery end of the pipe, substantially as described.

8. In a self-heating soldering iron,the combination with a tubularreservoir for liquid fuel and a pipe leading from one end thereof, of asmall air tube extending from near the other end of said reservoir tonear the delivery end of the pipe, and having that portion within thepipe wrapped with a heat resisting fibrous substance, substantially asdescribed. I

9. In a self-heating soldering iron, the combination with a tubularreservoir for liquid fuel and a pipe leading from one end thereof, of asmall air tube extending from near the other end of said reservoir tonear the delivery end of the pipe, and avalve surrounding said tube whenit enters the pipe, substantially as described.

10. In a self-heating solderingiron, the combination with a tubularreservoir for liquid fuel, and a pipe leading from one end thereof, of asmall air tube extending from near the other end of said reservoir tonear the delivery end of the pipe, and a valve having a passage wayalong one side and surrounding the tube where it enters the pipe,substantially as described.

11. In a self-heating soldering iron, the combination with a tubularreservoir for liquid fuel having a large filling orifice near one end,of a delivery pipe leading from that end of the reservoir close to thefilling orifice, and an adjustable valve controlling that end of thepipe and accessible through said orifice, substantially as described.

12. In a self-heating soldering iron, the combination with a tubularreservoir for liquid fuel and a pipe leading from one end thereof, of anair tube located inside of said reservoir and pipe, and extending fromnear one end of the reservoir to near the delivery end of the pipe,substantially as described.

13. In a self-heating soldering iron, the combination with the pipe D,of the collar G of non-conducting material having a metallic bushing gscrewed upon the pipe D, the burner H, the union G, and thenon-conducting washers g at each end of the collar, substantially asdescribed.

14:. In a soldering iron, the combination with'the holder L havingopenings in its sides, of the swiveling ring N having pins 02, and a tipscrewed upon the projecting portion of said ring, substantially asdescribed.

In testimony whereof I afiilx my signature in presence of two witnesses.

T. W. EVERSOLE.

